Then you're in for a rude awakening. You know how all of the iPhones got 3 major iterations of each and every iOS update? That means that folks with 2-3 year old machines think that their phone, while rather capable, should be able to do all of the stuff that the newer iterations can/should do.

It happens a lot more than you'd think.

Seriously, earlier today a person had the original 4gb iPhone, was not happy that it didn't get iOS 6. That phone is now 6 years old. Still worked though, looked great actually. But it's still almost 6 years old.